We should all be familiar with ultraviolet light. As the visible light spectrum spans from red to violet, going beyond the violet we can see takes us into waves of radiation that we can’t see, but can perceive in other ways—UV rays give us our suntans and sunburns. On the other side of the visible light spectrum is another type of radiation that we can’t see: infrared light. Meaning “below red,” this radiation has longer wavelengths than red light. You may wonder: where do we use infrared waves in everyday life?
Remote Controls
Falling between microwaves and visible light, infrared is one segment of the electromagnetic spectrum of radiation. Within the infrared segment of the spectrum, different wavelengths behave differently. Some generate heat, while others don’t. One nonthermal application of infrared light lies in the palm of your hand: the trusty remote control you use to navigate an increasingly complex television landscape of linear channels, streaming services, and various peripherals. That little glass bead at the front of your remote communicates with your television or set-top box.
Heat Lamps
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Fiber Optics
One area where we use infrared waves in daily life might include your internet. Because of the properties of infrared light, it’s the ideal choice for optical fibers, which transfer information at high speeds—such as a high-speed internet connection. Even if you have Wi-Fi in your home, broadband infrastructure at large relies heavily upon optical fibers transmitting infrared waves to modems. Just on the other side of visible light, this information travels at nearly the speed of light.
